You probably have a hole in the hose that controls the water level. I had mice chew a hole in mine. Tear apart the panel that contains the dials and knobs and you should be able to see the hose. In most cases it is clear.

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You must shut the water valve to change the water filter. If you don't havewater valve near the fridge, shut the main water valve for few minutes. If you turn the water filter to change without shutting the water valve, lots of water flooring the fridge and you do lots of work to remove the water inside the fridge. Shut the water valve, and then replace the filter. Then turn the water valve.

To clean it, shut off the discharge valve at the water heater. Then, you shut the valve off of the main water supply. After which, you can start cleaning the single knob shower cartridge. After the cleaning job, you can open the discharge valve of the water heater, then, thevalve of the main water supply.